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Old Oct 05, 2012, 03:27 PM
AMA 905510
United States, NY, New York
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@UAV.Pilot
Would you mind sending me the contact information with whom has helped you from DJI? I would like to contact them directly and get my S800 tuned in

And would there be a school near by NYC?
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Old Oct 05, 2012, 03:28 PM
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United States, MI, Goodrich
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Originally Posted by uav.pilot View Post
some good posts guys...very interesting indeed

ferdinand sweet landing gear mod! I have the same thing in mind, would you share pics and possibly a build list of parts?

I got a lot of white flashed right before mine flipped as seen on my vid, now that i have been in communications with dji directly they are certain that in my case i did not use their supplied double sided sticky tape with the installation of the imu, causing vibrations and making the imu erratic.

Im not buying it completely because its the same tape we have used in all of our other builds for tens of years 3m adhesive foam core 1mm tape, very stout...now this wkm is susceptible to vibrations unlike other similar systems...just dont sound right to me. But possibly so? I did not notice any vibrations in my flights. In fact i think i even made a comment how smooth it actually flew.

Dji has stated that the imu must be installed using their double sided sticky tape provided in the kit, and in no way should any substitute be used. Including gel ext...

Having said that, dji did take care of me and spent a good amount of time with my ship, and dialed it in! It's on its way back ready to work, and for this i am thankful! They did back up their product better than other companies i have seen. For me customer service is #1 on my list, over performance, in any product i buy if i cant get good service if and when i need it, then its worthless!

I ordered props from robert the other day and i gotta say he also took very good care of me! His customer support is right on par

all of this adds up to great customer service from dji, and this alone is what i look for when i invest my hard earned money in any company. Had i been treated differently it would have been my last dji purchase and many other's that are peering onto me and my flying machines.

We are a uav university now established in conjunction with asu and plan to have a fleet of uav systems, this s800 was purchased to do the safety trials for the school. It has yet to fly in front of anyone and this delay almost made us go to another well known platform.

Once i get this s800 back i will report what i received and how it flies, looking forward to it! With any luck this thing will be right and we will be using it for our flight school.
unmanned university
:d
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Old Oct 05, 2012, 08:30 PM
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Im not buying it completely because its the same tape we have used in all of our other builds for tens of years 3m adhesive foam core 1mm tape, very stout...now this WKM is susceptible to vibrations unlike other similar systems...just dont sound right to me. but possibly so? I did not notice any vibrations in my flights. in fact i think i even made a comment how smooth it actually flew.

DJI has stated that the IMU must be installed using their double sided sticky tape provided in the Kit, and in no way should any substitute be used. including Gel ext...
I've been using Zeal Gel for years, and I really never took caution to DJIs warning to use there supplied tape, I guess this is because I used to fly nitro helicopters and Zeal Gel was the extra insurance to eliminate vibes. I also have never experienced the white flashes like a lot of other people here, yes I have seen them, but not during flight and I always thought it might be from the Gel. Is anyone else here using Gel? I'm a little nervous hard mounting it with the supplied tape given my good track record with Zeal Gel, but if I run the risk of DJI not standing behind there product if I do (in your case they did, but for others they may not), I may switch to there supplied tape.

Does anyone have any thoughts on this? Should I switch to the DJI tape?

Thanks
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Old Oct 05, 2012, 09:52 PM
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Right... So im looking for results just as everyone else is...

DJI requires us to use their double sided tape because the vibrations will be eliminated by IMU dampening and IMU needs to be firmly attached to the S800

So my plan is to do some trial and error tests! Did a little shopping and I ending up buying rolls of scotch permanent tape

Now the tape that was provided by DJI has written 3M VHB on it. Does anyone has more specifics on this tape provided from DJI?

The scotch tape in the pictures I will use in tomorrow test to see which one eliminates the white flashes. I am first starting off with DJI tape. If that doesn't work, I will use clamps to clamp down the IMU. Then I will try the other tapes and see which one has the least flashes!

Any comments before I do this?

- I will keep away from zeal tape for this experiment
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Old Oct 06, 2012, 12:29 AM
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Originally Posted by Polishchris View Post
Right... So im looking for results just as everyone else is...

DJI requires us to use their double sided tape because the vibrations will be eliminated by IMU dampening and IMU needs to be firmly attached to the S800

So my plan is to do some trial and error tests! Did a little shopping and I ending up buying rolls of scotch permanent tape

Now the tape that was provided by DJI has written 3M VHB on it. Does anyone has more specifics on this tape provided from DJI?

The scotch tape in the pictures I will use in tomorrow test to see which one eliminates the white flashes. I am first starting off with DJI tape. If that doesn't work, I will use clamps to clamp down the IMU. Then I will try the other tapes and see which one has the least flashes!

Any comments before I do this?

- I will keep away from zeal tape for this experiment
Clamping it down to the S800 with all the vibes from the stock props might not be a good idea, but I'm interested in the results none the less.
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Old Oct 06, 2012, 03:06 AM
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i'm guessing the clamps are just to hold it in place, some tape suggest leaving the item you've just 'stuck' for 15mins. i doubt whether he's planning to fly with clamps ;-)
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Old Oct 06, 2012, 05:11 AM
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Does anyone else feel like this is crazy? Still no official response from DJI about the obvious FOD issues? People are reporting white flashes, which seem to be coming from vibrations caused by overly flexible arms or unbalanced stock CF props. Is this the cause? To use Zeal Tape or not to use Zeal Tape... that is the question. Tahoe Ed thinks this will only confuse the sensors in the IMU, others say rock the Zeal Tape and drop the IMU in the center of the center plate. Denny seems to think the FC can be overloaded with information. Is that the cause? We've got UAV.Pilot with a feel good customer service story, but double sided sticky tape was the cause of his FOD? Really? That's how sensitive this FC is? Robert has direct contact to DJI, has he heard anything from them about this? They are clearly aware of it. Are they working on a more comprehensive fix? Sitting on our s800 while these issues get resolved is not my idea of "feel good customer service".
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Old Oct 06, 2012, 05:22 AM
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does anyone else feel like this is crazy? Still no official response from dji about the obvious fod issues? People are reporting white flashes, which seem to be coming from vibrations caused by overly flexible arms or unbalanced stock cf props. Is this the cause? To use zeal tape or not to use zeal tape... That is the question. Tahoe ed thinks this will only confuse the sensors in the imu, others say rock the zeal tape and drop the imu in the center of the center plate. Denny seems to think the fc can be overloaded with information. Is that the cause? We've got uav.pilot with a feel good customer service story, but double sided sticky tape was the cause of his fod? Really? That's how sensitive this fc is? Robert has direct contact to dji, has he heard anything from them about this? They are clearly aware of it. Are they working on a more comprehensive fix? Sitting on our s800 while these issues get resolved is not my idea of "feel good customer service".
+1.
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Old Oct 06, 2012, 07:41 AM
jab
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Originally Posted by capo creative View Post
does anyone else feel like this is crazy? Still no official response from dji about the obvious fod issues? People are reporting white flashes, which seem to be coming from vibrations caused by overly flexible arms or unbalanced stock cf props. Is this the cause? To use zeal tape or not to use zeal tape... That is the question. Tahoe ed thinks this will only confuse the sensors in the imu, others say rock the zeal tape and drop the imu in the center of the center plate. Denny seems to think the fc can be overloaded with information. Is that the cause? We've got uav.pilot with a feel good customer service story, but double sided sticky tape was the cause of his fod? Really? That's how sensitive this fc is? Robert has direct contact to dji, has he heard anything from them about this? They are clearly aware of it. Are they working on a more comprehensive fix? Sitting on our s800 while these issues get resolved is not my idea of "feel good customer service".
+2.
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Old Oct 06, 2012, 07:42 AM
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One has to assume that the latest 5.14 version has been given the all clear. I am as satisfied as I can be that this model is safe to fly. I have been testing with different props. this week and no white flashes. Thus far it has been reliable...... My personal choice is the 14x4.7 APC's but some say they prefer Xoars. Either way I am not seeing any vibration problems. Standard IMU Mounting.
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Old Oct 06, 2012, 07:55 AM
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My personal choice is the 14x4.7 APC's
Better than the Graupner 14x8' ?
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Old Oct 06, 2012, 09:41 AM
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Beginning next week (after Chinese Holiday) I will do my best to get answers etc.
I have Denny's adapters coming next week and a ton of the 14 Graupners.
I have 15" Xoar" being custom drilled to fit stock motors.
I'm going to do everything I can to find the best prop solution for the S800 or at the very least provide the tools for others.

IMU Mounting:

The Imu's have internal dampening. They like to be hard mounted. They have all been like this and recommended to do so.

As crazy and simple as it might sound, I still want to stuff memory foam in between the frames and/or around the IMU and see if that makes a difference for soaking up these high freq vibes.

FOD: I have no idea on the cause. The majority don't have this issue but yet some do.

As soon as I hear something I will post it for sure.
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Old Oct 06, 2012, 10:49 AM
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Compliments are in place, this is customer service!
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Old Oct 06, 2012, 11:43 AM
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@UAVProducts,
What about Dennys adapters for the graupner 14x4.7props. Does XOAR 15x5 props fit? Or do you prefer xoar with two extra drilled holes?
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Old Oct 06, 2012, 11:51 AM
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@UAVProducts,
What about Dennys adapters for the graupner 14x4.7props. Does XOAR 15x5 props fit? Or do you prefer xoar with two extra drilled holes?
The adapters will fit the Graupners and what I will be testing first.
Xoar is just doing a special batch for us to test.
Once I get everything I'll figure it out.
Denny is really the expert on this right now.
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